If you have a Dual Core processor, Windows XP, an NVIDIA GeForce 9500GT Graphics card( like me, :/ ) FOR EXAMPLE,

Then you will get away with it on medium settings..Turn Anisotropic filtering and Anti Aliasing right Down as these are designed to smooth off corners and such and basically just chuck a hell of a load more polygons into there, (you'll see the names in the settings) you are better keeping it low for those settings, the less polygons it has to render, the higher your fps will be (Frames Per Second = not as laggy).

Set the settings to medium, some can be on low if you so desire, remember, the less demand on the graphics, the faster your game will run.....( You can toggle these settings once in game to find your ideal compromise..)

If you are considering buying this game, I might suggest you hang on for the bundle pack that is due out soon..mid-Late Summer, guys?...This has the DLC's included. Alternatively, buy the Game now, and wait for the Hyped up prices to fall and get the DLC's at a later Date, the Vanilla is pretty good to be going on with for starters....

ABOVE ALL..This is the future for gaming, and, like me, you like gaming and so wish to continue in the future, you are going to have to upgrade your comp anyway...so go ahead, buy the game, you can't lose really, because upgrading hardware is pretty much a given, indeeeeed!!! :D

i have a i3 8gig ram and nvidia geforce 360 graphics card and i can say i run smoothly on high and with 2k HD texture pack, altough my FPS drops at the swamp where the abandoned shack is but its pretty well..